| http://www.w3.org/ns/prov#value | - uating members mounted for reciprocal horizontal movement relative to said respective opposed supporting walls; (c) each of said actuating members including means forming at least one pair of divergent cam surfaces, said cam surfaces including an upper cam surface inclined upwardly and a lower cam surface inclined downwardly; (d) upper and lower follower means supported on said upper and lower cam
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